511101100123 has 2 divisors, whose sum is σ = 511101100124. Its totient is φ = 511101100122.

The previous prime is 511101100019. The next prime is 511101100189. The reversal of 511101100123 is 321001101115.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-511101100123 is a prime.

It is a super-2 number, since 2×511101100123² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 511101100097 and 511101100106.

It is not a weakly prime, because it can be changed into another prime (511101107123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255550550061 + 255550550062.

It is an arithmetic number, because the mean of its divisors is an integer number (255550550062).

Almost surely, 2^511101100123 is an apocalyptic number.

511101100123 is a deficient number, since it is larger than the sum of its proper divisors (1).

511101100123 is an equidigital number, since it uses as much as digits as its factorization.

511101100123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30, while the sum is 16.

Adding to 511101100123 its reverse (321001101115), we get a palindrome (832102201238).

The spelling of 511101100123 in words is "five hundred eleven billion, one hundred one million, one hundred thousand, one hundred twenty-three".